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采用粉末冶金法,在TZM合金的基础上,固-液掺杂稀土元素La,且以有机碳源硬脂酸替代传统的石墨粉引入C元素,经混料、压制成形、高温烧结、热轧、温轧、冷轧等工艺制备La-TZM合金板材。将La-TZM合金板材分别在300、450、600、800、1000℃进行高温氧化实验,通过质量损失率、差热分析等实验方法研究其氧化行为。研究表明:La-TZM合金板材的抗拉强度为1361.74 MPa,伸长率为8.81%,较传统的TZM合金均有显著提高。La-TZM合金板材纤维组织细长,组织致密;第二相细小且分布均匀。其细小的氧化镧及第二相颗粒钉扎在晶界,生成的氧化物会在基体表面形成致密氧化物覆盖层,可以有效地阻碍氧向基体的侵入,表面不易氧化,从而使TZM合金的抗氧化性能提高,扩展了TZM合金的使用温度范围。
Based on the TZM alloy, solid-liquid doping rare earth element La was carried out by powder metallurgy method, C element was replaced by organic carbon source stearic acid instead of the traditional graphite powder, and then mixed, pressed and shaped, sintered at high temperature, , Warm rolling, cold rolling and other processes to prepare La-TZM alloy sheet. La-TZM alloy sheets were subjected to high-temperature oxidation test at 300, 450, 600, 800 and 1000 ℃, respectively. The oxidation behavior of La-TZM alloy sheets was investigated by means of mass loss and differential thermal analysis. The results show that the tensile strength of La-TZM alloy is 1361.74 MPa and the elongation is 8.81%, which is significantly higher than the conventional TZM alloy. La-TZM alloy sheet slender fibrous tissue, dense tissue; second phase fine and evenly distributed. The fine lanthanum oxide and the second-phase particles are pinned at grain boundaries, and the oxide formed will form a dense oxide coating on the surface of the substrate, which can effectively hinder the intrusion of oxygen into the substrate and prevent the surface from being easily oxidized, so that the TZM alloy Anti-oxidation performance, expanding the use of TZM alloy temperature range.